Add a fonction on my statistical tool (running on my server)

My need is really simple, I actually have a software that makes statistical calculations on numerical values stored in my database. Sometimes I ask the software to use an « automatical calculated coefficient » in its calculations.

On screen1 attached to this project you can see the actual box I check to apply this « automatical calculated coefficient » in calculations.

Now I need to be able to apply a coefficient to this « automatical calculated coefficient ». On screen2 attached to this project you can see what I need.

So if I enter for exemple X2 , the software must apply in his calculation « automatical calculated coefficient » X2.

If I enter for exemple +38 , the software must apply in his calculation « automatical calculated coefficient » +38.

If I enter for exemple -6,4 , the software must apply in his calculation « automatical calculated coefficient » -6,4.

If I enter for exemple /2,1 , the software must apply in his calculation « automatical calculated coefficient » /2,1.

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